Electric reciprocating engine.



ELECTRIC RECIPROGATING ENGINE.

W, A. STEDMAN.

APPLICATION FILED APR 25, 1910.

WITNESSES Patented May 2, 1911.

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APPLIUATION I'I'LED 5P3. 25,1910. Patented May 2 3 BHBETS-SHEET'Z.

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W. A. STEDMAN. ELECTRIC REGIPROGATI'NG ENGINE.

APPLIOATIQN FILED APE. 25,1910. Patenfiad May 2, 1911 3 SHEETS-sum s.

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WILLIAM ARMOR STEDMAN, OF MILLERS, NEVADA.

ELECTRIC RECIPROGATING ENGINE.

Specification of Letters Patent.

Patented May 2, 1911.

Application filed April 25, 1910. Serial No. 557,423.

To all whom it may concern:

Be it known that 1, WILLIAM A. S'rnD- MAN, a citizen of the UnitedStates, and a resident of Millers, in the county of Esmeralda and Stateof Nevada, have invented a new and Improved Electric ReciprocatingEngine, of which the following is a clear, full, and exact description.

Among the principal objects which the present invention has in view are:to provide means for operating the tamp bars of a stamp mill in fixedserial relation without frictional loss; to provide means wherebyindividual tamp bars may be independently operated, repaired orreplaced; to provide electric engines for the operation of the tamp barsconstructed to facilitate ventilation and heat radiation; and tosimplify and economize the construction of stamp mills.

One embodiment of the present invention is disclosed in the structureillustrated in the accompanying drawings, in which like characters ofreference denote corresponding parts in all the views, and in whichFigure 1 is a side elevation of the electric reciprocating motor shownin conjunction with a stamp mill of the usual construction, the stampmill being shown in vertical section; Fig. 2 is an enlarged detail Viewin vertical section, of the reciprocating motor constructed and arrangedin accordance with this invention; Fig. 3 is a plan view of one of theclamping plates, showing the grooved face for holding the structuralmembers of the solenoid in position; Fig. 4 is a view of the clampingplate, shown from the reverse side of that illustrated in the previousfigure, the tamp bar and supporting rods being shown in section taken onthe line 44 in Fig. 2; Fig. 5 is a cross section of the solenoid, takenon the line 55 in Fig. 2; Fig. 6 is a perspective View of the laminatedside structural framing member; and Fig. 7 is a diagrammatic view,showing the lay out of the operating circuits for one of the said motorsand a rotary commutator for energizing said circuits.

The form of stamp mill to which this in vention is peculiarly adapted isthat in which a series of mortars and tamps are used, arranged to form abattery. The tamp bars are lifted in serial order by tappet camsarranged upon a shaft. The shaft carrying the tappet cams is driven by amotor of any usual and well known construction. The tappet cam shaft ismounted in bearings carried in an overhead frame, which is necessarilycumbersome and heavy, due to the need for resistance to the rapidvibration of the mill when operating. The vibration is increased by thefact that the impact of the cams upon the heads of the tamp bars issharp and unyielding.

In the present invention I have substituted for the frame abovementioned upright supporting rods 11, 11. The upper end section of therods 11, 11 is reduced in diameter, and the extreme upper end of thereduced portion is provided with screw threads 12, 12, as shown. At thelower end of the said rods are provided screw threads 13, 13. Screw nuts14, 14 are provided and mounted upon the rods 11, 11 to receive andsupport a clamp plate 15, the nuts 14, 14 being adjusted to support thesame. The rods 11, 11, are threaded as atlG, 16, and held in tappedsockets formed in the frame of a mortar A, as shown in Fig. 1 of thedrawings. The threaded lower ends of the rods 11, 11 are provided withscrew nuts 17, 17, that may be adjusted to raise and lower the one orthe other of the rods 11, 11 to correct the vertical position of thesaid rods and the tamp bars operated by the electric engine supported onthe said rods 11, 11.

Between the plate 15 and a plate 18 is mounted a reciprocating electricengine. The engine in the present invention is composed of a pluralityof electric coils connected in series, and wound in the same rotarydirection. The coils, in the form approved by me, are wound and bound inspools 19, 19, as shown in cross section in Fig. 2 of the drawings. Thesaid spools are connected in series. By using the spool form of winding,the needed repairs are readily made by removing a damaged spool andsubstituting a perfect spool.

The spools 19, 19 are interposed between. enlarged end coils 20 and 21,each of which has an independent electric circuit. The spools 19, 19 andcoils 20 and 21 are threaded over a cylinder 22. The cylinder 22 isconstructed from non magnetic material. such as brass, and is providedon the outer surface with a suitable insulating material 23 adapted toelectrically insulate the said cylinder 22 from the said spools andcoils. The covered cylinder 22 is forced through central perforations ofthe spools 19, 19 and coils 20 and 21. Between each of the said spools19, 19 and coils 20 and 21 are interposed separating strips 2t, 24. Thestrips 2 1-, 24 are constructed of any suitable material, preferablynon-metallic and non-magnetic, and are arran ed in radial order, asshown in Fig. 5 of the drawings. The strips 24 serve to separate thesaid coils and said spools, to provide for a free circulation of air.

The clamp plates 15 and 18 are each provided with a central perforation25, 25, sufliciently large to pass the cylinder 22. The spools 19, 19and coils 20 and 21, when mounted firmly upon the cylinder 22, holdingthe interposed strips 2 between, are surrounded by a plurality ofseparated laminated casing loops 2G, 26. The loops 26, 26 are formedfrom hook-like sections having short end extensions 27, 27, which extendfrom the outer surface of the coils 20 and 21, to contact with thecylinder 22, as shown in Fig. 2 of the drawings. The hook-likeextensions are formed in two lengths, a short and long length, thecombined lengths of which are slightly less than the combined length ofthe spools 19, 19 and coils 20 and 21. In vertical arrangement of thesaid extensions, a long length and a short length are alined. In thelaminated disposition, a short length is held between two long lengths.hen the desired number of extensions have been compiled, the middlesection of the loops will be found to provi le for an endwisecontraction, while the sides of the adjacent extensions are in rubbingor metallic contact. In the present construction I provide a series ofsix of the loops 26. They are held in position upon the said spools andcoils by rings 28, 28, which are forced over the loops after the samehave been disposed in the desired position upon the said coils andspools. When the rings 28 are thus forced into position, the body of thesolenoid may be said to be completed. It is then placed in position onthe lower plate 15, the short extensions 27 of the loops 2G fittingwithin the grooves 29, 29 formed in the plate 15. When the solenoid isin position, the plate 18 is threaded over the rods 11, 11 and forceddown upon the top of the solenoid, adjusting the grooves 29, 29 formedin the said plate over the ends of the short extensions 27 of the loops26, as shown substantially in Figs. 1 and 2 of the drawings. Screw nuts30, 30 are engaged with the threaded ends of the rods 11, 11 and drivendown upon the plate 18. The nuts 30, 80 are forced upon the loops 2G,26, driving the overlapped ends of the long and short sections thereofin closer juxtaposition, and forcing in compact and fixed relation allof the spools 19, 19 and coils 20 and 21. By means of this constructionthe separate parts of the solenoid are held rigidly in position, beingbound more firmly by rods (38, (S8 and nuts (39, 69.

As before stated, an electric engine, of which the above describedsolenoid comprises an element, may be provided for each of the tamp barsB of a stamp mill. Connected to the upper end of the tamp bar 13 is asoft metal core 31, titted within the cylinder 22 to loosely movetherein without unnecessary vibration. The core 31 is formed to a lengthequaling the length of the com piled spools 19, 19 plus one of the coils20 or 21. The cylinder 22 thus serves to guide the tamp bar B to holdthe same in vertical disposition above the anvil C of the mortar A. Withthe engine arranged as thus described, by alternately energizing thecoils 20 and 21, the core 31 is raised and lowered, operating the tamp Dto crush the ore caught between the said tamp and anvil C.

The electric circuits whereby the spools 19, 19 and the coils 20 and 21are energized, are shown in diagram in Fig. 7 of the draw ings, togetherwith the commutator and accessories to the circuits. The commutatorillustrated in said figure consists of two sectors of metal, 32 and 33.The sectors 32 and are suitably mounted on a wheel or drum rotated by ashaft 34 Loosely mounted upon the shaft 34 are radially disposed arms 35and 36. On the outer ends of said arms 35 and 36 are suitably mountedbrushes 37, 38, 39 and 1-0. Each of the said brushes is insulated fromthe arm 35 or 36 in which it is mounted, and forms the terminal of anelectric circuit. The arms and brushes are adjustable, as shown indotted lines in Fig. 7. The circuits extending; from these terminals,operate to constantly energize the spools 19, 19, and to alternatelyenergize the coils 20 and 21.

The circuit arrangement is as follows: The brush 37 is connected bymeans of a branch wire 11 to the main (S0 of the electric supply. Thebrush iO is connected with the switch terminal 43 by a wire a2. Theswitch terminal 13 is disposed in contact relation with the terminal ofa branch wire 44, a continua tion of the coil 20. The coil 20, isconnected by a wire to a common branch wire 19. The branch wire 45 isconnected with a resistance coil 17, from which leads a wire 48 whichcontacts with the fixed post of a switch, which, in its lower position,contacts with a switch terminal 19. The switch terminal 41-9 is, bymeans of wires 50 and 51, connected with the brush 38. The fixedterminal of the switch operating upon the terminal is connected by meansof a wire 5% to the coil 21. The opposite terminal of the coil 21 is bymeans of a wire 55, 59 connected to the common branch 46. The connectionbetween the branch 46 and the resistance coil 47 with the brush 38 hasbeen above outlined in tracing the circuit energizing the coil 20.

As above described, the energizing of the coils 20 and 21 isalternative. At all times during the operation of the engine the spools19, 19 are energized. The said spools are connected by means of a wire58 with both of the switch terminals 57, 57, hence in both thrownpositions of the double throw switch employed in this invention thewires 56 and 58 are in circuit with the main supply. The wire 58 isconnected with one of the terminals of the spools 19, 19. The oppositeend of the spools 19, 19 is connected to a wire 59, 45, 55, which is inturn connected with the coils 20 and 21, and also with the common branch46. 4

The operation of the circuits above described is as follows: The shaft34 is constantly rotated in the direction indicated by the arrow in Fig.7. This rotation presents the sectors 32 and 33 alternately to thebrushes 37, 39 and 37, 40, and also alternately bridges between thebrushes 38, 40 and 38, 39. In the drawings, the sectors are shown in thedisposition wherein the brush 37 is connected with the brush 40 throughthe sector'33. In this arrangement of the commutator the acting circuitis as follows: The wire 56 is connected at a with the main 61. The wire56, through the switch 57, is connected with the wire 58. The circuitfollows the arrows marked a. From the wire 58 the circuit passes, asshown by the arrows, through the spools 19. At the oppo site end of thespools the terminal connects with the wire 59, 45, which is connectedwith the coil 20. The circuit passes through the coil 20 in thedirection of the arrows marked 0 and leaves the same by the wire 44. Thewire 44 is connected through the switch terminal 43, when the switch isso disposed, to the wire 42 which wire 42 is connected with the brush40. The brush 40 being in contact with the brush 37 through the sector33, the current passes from the said brush 37 through the wire 41 to themain 60 of the supply, thus completing the circuit through the spools 19and the coil 20.

The circuit above described is established through the spools 19 and thecoil 20 simultaneously. In this position of the sectors the lower coil21 is not energized, therefore the active solenoid is constituted withinthe length occupied by the spools 19 and the coil 20. The core 31 islifted to the position shown in dotted lines in Fig. 7, centrallydisposed with reference to the spools 19 and coil 20, and above the coil21.

hen the commutator is rotated so that the sector 33 passes out ofcontact with the brush 40, it passes under the brush 39, connecting thelatter brush with the brush 37. This disposition of the sectors operatesto change the circuits as follows: The circuit now is from the wire 56through the terminals 57, the wire 58, through the spools 19 to the wire55. From the wire 55 the current is through the coil 21. The coil 21 isconnected by means of the wire 54 to the switch 53. The current in thecoil 21 and wires connected therewith is indicated by the arrows marked2). From the wire 53 the circuit is through the wire 52 to the brush 39,from the brush 39 over the sector, to the brush 37, and thence by thewire 41 to the main 60.

With the current established as above described, the coil 20 isdenergized, while the coil 21 is excited. This changes the active areaof the solenoid to include the spools 19 and the coil 21. The core 31 isthen dropped by the downward pull, until it rests in the relation to thelower coil 21 that it formerly bore to the upper coil 20, causingthereby a downward thrust or drop of the core 31, tamp bar B and partsconnected therewith.

The above described alternations of the circuits are produced in rapidsuccession. It is, however, desirable that the circuit estab lished inthe coil 20 should be for an increased period of time over that in whichthe current is established in the coil 21. This is for the reason that,attached to the core 31 is the weight of the tamp bar B and temp D,requiring a greater length of time for the current flow to produce thenecessary magnetic lift. This is accomplished by shifting the arm 36 todispose the brushes 37 and 40 and 38 and 39 in closer relation each tothe other than are the brushes 37 and 39 and 38 and 40. This arrangementproduces dispro portioned periods of time during which the brushes 37and 40 and 37 and 39 are in contact with the same sectors, the brushes37 and 40 being considerably longer in contact with the sectors than thebrushes 37 and 39. As above described, the wire 45, 55, 59, which formsthe connection between the spools l9 and the coils 20 and 21, isconnected to the common branch 46. The circuit formed by the branch 46,the resistance coil 47, the wires 48, 50 and 51, the brush 38 and thewires connecting the brushes 39 and 40 with the coils 21 and 20, isprovided to form a relief circuit to dissipate or dissolve the inducedor static current produced. by the induction in the coils 20 and 21. Thecircuit through each of the coils and the resistance coil 47, isestablished whenever either of the sectors 32 or 33 bridges the spacebetween the brushes 38 and 39 or 38 and 40. By bridging the said brushesit will be noticed that a completed circuit is formed, including thecoil 20, and the resistance coil 47 or the coil 21 and the resistancecoil 47. This circuit through the resistance coil 47 and one of thecoils 20 or 21 is simultaneous with the establishment of the activecircuit in the other coil. For instance, as shown in Fig. 7, the activecurrent is established by the sector 33 bridging the brushes 37 and a0.This disposition of the parts has established an active current in thecoil 20. The sector 32 coincidently bridges the space between thebrushes 3S and 39, thereby establishing a circuit including theresistance coil at? and the coil 21. lVith the rotation of the sectors,and simultaneously with the passage of the sector 33 under the brush 39,the sector will pass under the brush 40. In this arrangement an activecircuit is established in the coil 21, while the circuit through thebrushes 38 and it) is completed through the coil 20 and resistance coill7. By means of this arrangement the inductive tension established inthe coils 20 and 21 is dissipated through the coil 47, thus avoidingarcing due to the rapidly changing electro-magnetic currents.

In the employment of the loops 26, 2G, disposed and constructed in themanner as above described, I provide for the establishmentof increasedmagnetic effects, presenting alternately active field flows, whichassist in the lift of the core 31. The magnetic currents are, by reasonof the laminated and lapped end constructions, unimpaired and unbroken.

The core 31 is provided with a series of vertically disposed slots (32,G2; the cylinder 22 with a vertically disposed slot (53; and theclamping plates 15 and 18 with vertically disposed slots 64, 6 1-; allfor the purpose of preventing the establishment of counter-currents inthe cylindrical or ringlike members of the construction, during theoperation of the invention.

Between the engine and commutator is disposed the tour pole double throwswitch, in dicated in Fig. 7 of the drawings. When this switch is liftedout of contact with the terminals at both ends of the throw, the engineis electrically disconnected. hen the switch is thrown to the upperposition, wherein the blades are connected with. the upper switchterminals, then the wire at is electrically connected with the wire (35,which is connected to the main 60. The wire 42 is thereby thrown out ofcommission. As above described, the terminals 57, 57 are bridged by thewire 56, which is connected with the main 61. By this arrangement, thewire 56 is not thrown out of commission. The switch blades, which in thelowered position contact with the terminals 53 and 19 in the upperposition, contact with the posts 66, 67, which form no part of theelectric circuit. This throws the wires 50, 51 and 52 out of commission.In this position the rotation of the sectors does not affect the coils20 and 21 and spools 19. The current thus established constantly flowsthrough the spools 19 and the coil 20, thereby lifting,

and maintaining lifted, the core 31 and parts connected therewith.

By this arrangement a simple device is provided for holding the tampssuspended during necessary repair or inspection. lVith the dropping ofthe switch the tamps are permitted to fall into lowered position.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. An electric reciprocating engine comprising a solenoid having aseries of distinct superposed section windings, the middle winding beingconnected in series with each of the end windings; an operating electriccircuit suitably connected with an electric source embodyii'ig saidmiddle winding and one of said end windings of said solenoid; anindependent electric circuit embodying a resistance coil and connectedwith the inactive end coil of said solenoid; a supporting frame for saidsolenoid; a rotary switch having a plurality of curved metal sectorscylindrically arranged and adapted to be rotated; a plurality of brushesadapted to electrically contact with said sectors, said brushes formingthe terminals of the said operating and independent circuits; and meansfor adjusting the said terminals to Vary the relative distances betweenthe said terminals to effect a prolongation of the circuit closure inone of the said end windings.

2. An electric reciprocating engine comprising a solenoid having aseries of distinct superposed section windings, the middle winding beingconnected in series with each of the end windings; an operating electriccircuit suitably connected with an electric source embodying said middlewinding and one of said. end windings of said solenoid; an independentelectric circuit embodying a resistance coil and connected with theinactive end coil of said solenoid; a supporting frame for saidsolenoid; a rotary switch having a plurality of curved metal sectorscylindrically arranged and adapted to be rotated; a plurality of brushesadapted to electrically contact with said sectors, said brushes formingthe terminals of the said operating and independent circuits; and meansfor adjusting the said terminals to vary the relative distances betweenthe said terminals to effect a prolongation of the circuit closure inthe uppermost of the said. end windings.

An electric reciprocating engine comprising a solenoid having a seriesof distinct superposed section windings, the middle winding beingconnected in series with each of the end windings; an operating electriccircuit suitably connected with an electric source embodying said middlewinding and one of said end windings of said solenoid; an independentelectric circuit embodying a resistance coil and connected with theinactive end coil of said solenoid; a supporting frame for saidsolenoid; a rotary switch em- In testimony whereof I have signed mybodying a plurality of curved metal sectors name to this specificationin the presence of 10 cylindrically arrangefd and adapted to be rptwosubscribing Witnesses. tated' a luralit 0 brush arms revolub V 5 mounted:once1f1 1 ic With the said sectors WILLIAM ARMOR STEDMAN' and electriccontact brushes mounted on said Witnesses: arms and forming theterminals of the said JOSEPH H. DALE, operating and independentcircuits. F. F. DUPREY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). C.

